Lathe.



F. ROWE & J. W. RAPPENGLUEGK.

LATHE; APPLICATION FILED NOV. L8, 1909.

979,034. Patehted Dec.20, 1910.

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UNITED STATES PATENT critica FRANK ROWE A'ND JOSEPH w. RAPPENGLUECK, or Pom HURON, MICHIGAN; SAID RAPPENGLUECK ASSIGNOR TO SAID ROWE.

LATHE.

Specification of Letters Patent;

Patented Dec; 20, 1910.

Application filed November 1a, 1909. Serial No. 528.695.

provements in Lathes; and we do declare the following to he a full, clear, and exact description of the intention. such as will enable others skilled in the art to which it appertains to make and use the sa me, reference being had to the accompanying drawings, and to the figures of reference marked thereon. which form a part ofthis specifica-- tion.

This invention-relates to lathesyand consists 1n the constructlon and arrangement of parts hereinafter more fully set forth and pointed out particularly in the claims.

The object of the invention is to provide the live spindle of a lathe with a center, said center having a stop or shoulder against which the faced work may he carried in placing it in the lathe to properly position said work," said center having a spring said arresting shoulder or stop at the, forward end of said center, said pin being; adapted to recede as the work 1s placed in the lathe to permit said work to he carried against said shoulder when placed in position' in the lathe, the tapered end ofsaid pin remaining in engagement with the work to center it;-provision being made for varying the tenslon upon the spring which normally holds the center pin extended and for perpressed center pin within the removablemitting the pin to project farther from the center to compensate for any shortemngm .the length thereof incident to regrinding a 40 I new point, thereon.

The above olnect isfattained by the structure illustrated in -the accompanying draw- 'ings.- in which Figure 1 is an elevation of a lathe embodying this invention. Fig. 2 is an enlarged longitudinal section throughthe live spindle and center, showing the spring center in said spindle. Fig. 3 is a transverse section on line 3 3of- Fig. 2. Fig. 4 i is a perspective view ofthe center pin,

showingthekey way therein and the key lifted from said way.

Referring to 1 designates the lathebed 2 the head stock;

.pin 11 having a tapered point thereon: 5 the tail stock, and (i the tool rest, all of which are common int-he art.

Formed, in the spindle 3 is a tapered socket 7 in which is fitted the center 8. At the outer end of "said center is a flat circular face forming a stop shoulder 9. Extending longitudinally of the center 8 is a bore 10 in the outer end of which is vfitted a. center 12 to enter the center hole in the work.

sible spring 13, the forwardvend of which engages the rear end of the center pin. Bearing against the rear end of said spring is a washer 14 and engagingrsaid washer is a screw 15 which is threaded in the rear end of said center and adapted to crowd said washer against-therein end of said spring to regulate the tension thereof.

Extending longitudinally of' the center pin 11 is a ke 1 way 16. Occupying the rear portion ,of said key way is a key 17. Threaded in the wall of the center 8 is a screw 18 having a reduced end portion 119 whichextends into the way 16 in the center pin, the forward end of the key 17 in said way en- 3 the live spindle; 4: the face plate carried 1 Also located with1n the bore of said center'is acompresgaging the reduced end of the screw lying therein. The key 17 engaging the-reduced end ofthe screw 18 prevents the center pin being forced out of the center by the spr ng 13, while the open or unoccupied P01131011 of the key way 16 in advance of said screw allows the center center 8 until arrested by the engagement of pin to recede within the said screw with the outer end'of said way,

as shown by dotted lines in Fig. 2. Thei 18\ spring pressed center'pin causes said pin to turn with the" presence of the inner-end of the screw in the key way 16 of the center 8.

It is of material importance in turning many pieces of the same character upon which the same work is to be'performed, 1n order to facilitate said work, especially where it consists oftur'ning to a given diameter between fiiied distances, to providea' stop-which will arrest the pieces when placed in the lathe at a given point so that there may be an unvarying relation between a certain fixed point on the work to be turned and a predetermined position of the tool rest. the characters of reference, 4

We attain the desired object by providing the outer end of'the. live center 8 with a stop shoulder 9 against which the work after being faced off, may be carried and by proridinga spring pressed center pin 11 which will recede sufiiciently to alow the work centered in the lathe to engage said shoulder, the spring holding the pin with sufiicient force to serve as the supporting center-for the work. By this means the succeeding pieces of work may be readily placed in the lathe with the assurance that each succeeding piece will be brought to the same relative position, so that by moving the tool rest to a predetermined position with respect to each piece of work, the turning thereon may be-always done at a given i distance from the faced end.

Should the point of the center pin become broken so as to necessitate-the regrinding of a-pointthereon, and the consequent shortening of said pin, provision is made for allowing said pin to project farther from thecenter 8 by cutting from the end of the. key 17 a portion equal to the extent that the center pin is shortened by the operation of regrinding the point thereon. Should it be desired to remove the center pin entirely,

it maybe readily accomplished by with drawing the screw there is a greater lateral strain upon the 18 from engagement with .-the key 17. In case of heavy work where yonol the face of said stop, pressing said center pin outwardly, means for holding said pin against the outward center pin, additional tension may be added to the spring 13 to-hold said pin to its work i by a manipulation of the screw 15 to still further compress said spring within the bore of the center 8.

pin having a key way therein, a loose key occupying a portion of said way, a stop projecting into the unoccupied portion of 'said way at the end of said key, and a spring within the center for p111 outwardly.

2. In a lathe, the combination with a pressing the center live spindle, a centerfitted therein having a \stopa't its outer end whichextends beyond the end of the spindle and face plate, a center pin within said center projecting bea spring for pressure of said sprin means for 'permitting said pm to recede w1th1n the center against pressure applied to-the outer end or 'varylng the tension thereof, and means upon said spring.

In testimony whereof, we sign this speci-' fication in the presence of two witnesses.

FRANK ROWE. JOSEPH W. RAPPENGLUECK. Witnesses:

ELLWYN C. SKIMIN, Monms D. MACKOY. 

